Rules:

ONE app only per week, please. Do you like a few? Come back next week and submit your 2nd.You can choose whatever OS you like. iOS, Android, OS X, Windows, whatever.

Example:

[Android] Bluebox Heartbleed Scanner - free - scans apps and your OS for vulnerability to the HeartBleed Security flaw everyone was worried about last week, and even though it seems to have quieted down, there are still sights getting patches. Unfortunately, if your OS itself is vulnerable, there's probably not much you can do. I tried this app on my Nexus 5 and the Android OS OpenSSL version (1.0.1e) was vulnerable but with heartbeats disabled. When I tried it on my dad's Atrix, it was listed as vulnerable and to contact the manufacturer, but good luck with that.